oneul san gyeongchineun eottae?

A natural breakdown is:

• 오늘 = today
• 산 경치 = mountain scenery / the view in the mountains
• 경치는 = as for the scenery... because -는 is the topic marker
• 어때? = how is it? / what’s it like?

So the sentence is basically:

Today, as for the mountain scenery, how is it?

In natural English, that becomes something like How’s the mountain scenery today?

That is very common in Korean. Time words like 오늘, 어제, 내일, 지금 often appear without any particle.

So:

• 오늘 산 경치는 어때? = perfectly natural
• 오늘은 산 경치는 어때? = also possible, but now 오늘은 adds contrast, like What about today, then?

Also, learners often wonder about 에, but 오늘에 is not used in normal Korean. For basic time expressions like today, tomorrow, and yesterday, Korean usually just uses the word by itself.

Because Korean often lets one noun directly modify another noun.

So:

• 산 경치 = mountain scenery
• 바다 경치 = sea view
• 도시 풍경 = city scenery

This is very normal in everyday Korean.

You can say 산의 경치, but it sounds more explicit and sometimes a bit more literary or formal. In everyday speech, 산 경치 is simpler and more natural.

So here, 산 is not acting like an adjective in the English sense. It is a noun modifying another noun.

-는 marks 경치 as the topic.

That gives the sentence a feeling like:

As for the mountain scenery today, how is it?

This is slightly different from using -가.

Compare:

• 산 경치는 어때? = How about the mountain scenery? / talking about it as the topic
• 산 경치가 어때? = more directly How is the mountain scenery?

In many situations, both are possible. But -는 often sounds like you are bringing up that item for discussion, while -가 can sound more like you are asking specifically about that subject.

어때 comes from the descriptive verb 어떻다, which means to be how / to be what kind of way.

Its common forms are:

• 어때? = casual
• 어때요? = polite
• 어떻습니까? = formal

In conversation, 어때? is one of the most common ways to ask:

• How is it?
• What’s it like?
• How do you find it?

So in this sentence, 어때? is asking for an opinion or impression about the scenery.

It is casual because it ends in 어때?

You would use this with:

• close friends
• younger people
• children
• someone you speak casually with

If you want to be polite, say:

오늘 산 경치는 어때요?

If you need a more formal style, you could say:

오늘 산 경치는 어떻습니까?

For most everyday polite conversation, 어때요? is the safest upgrade.

This is a very smart question, because 산 can indeed be:

• 산 = mountain (noun)
• 산 = bought, the modifier form of 사다

For example:

• 오늘 산 책 = the book I bought today

So a learner might wonder whether 오늘 산 경치 could mean the scenery I bought today.

Grammatically, that kind of ambiguity can happen in Korean. But in this sentence, the normal interpretation is clearly mountain scenery, because buying scenery does not make much sense in ordinary context.

So yes, the form is technically ambiguous at first glance, but in real usage the meaning is clear.

Yes, that is also okay, and it sounds very natural.

Here is the nuance:

• 오늘 산 경치는 어때? = casual, topic on 경치
• 오늘은 산 경치가 어때요? = polite, with 오늘은 adding a bit of contrast or focus on today

That version can feel like:

• How’s the mountain scenery today?
• What’s the mountain view like today, compared with other times?

So the differences are mostly about:

1. speech level

   • 어때? = casual
   • 어때요? = polite

2. focus

   • 오늘은 highlights today
   • 경치가 focuses more directly on the scenery as the subject

These are nuance differences, not huge meaning changes.

Yes, in a way. Korean often leaves out words that English would have to include.

In English, you would usually say:

• How is the mountain scenery today?
• How does the mountain view look today?

English needs a clear subject structure. Korean does not always need that. Once 경치 is introduced as the topic, Korean can simply ask 어때?

So there is no extra word for it, but the meaning is understood from context. That kind of omission is extremely common in Korean and is something English speakers need to get used to.